CVE-2026-101015 (GCVE-0-2026-101015)

Vulnerability from cvelistv5 – Published: 2026-09-28 08:30 – Updated: 2026-09-28 08:30
VLAI
Title
Trusted Domain Project OpenDMARC policy.c improper validation of unsafe equivalence in input
Summary
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is some unknown functionality of the file policy.c of the component Domain Handler. Executing a manipulation can lead to improper validation of unsafe equivalence in input. The attack may be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version CPE status
Trusted Domain Project OpenDMARC Affected: 1.4.0
Affected: 1.4.1
Affected: 1.4.2
    cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
WeitongLi (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
          "cpes": [
            "cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Domain Handler"
          ],
          "product": "OpenDMARC",
          "vendor": "Trusted Domain Project",
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              "status": "affected",
              "version": "1.4.0"
            },
            {
              "status": "affected",
              "version": "1.4.1"
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            }
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          "type": "reporter",
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        }
      ],
      "metrics": [
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      "references": [
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          "name": "VDB-410885 | Trusted Domain Project OpenDMARC policy.c improper validation of unsafe equivalence in input",
          "tags": [
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          ],
          "url": "https://vuldb.com/vuln/410885"
        },
        {
          "name": "VDB-410885 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
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            "permissions-required"
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        },
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          "tags": [
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        },
        {
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          "tags": [
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        },
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          "url": "https://weitongli.com/share/opendmarc-unicode-dot-bypass.html"
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      "title": "Trusted Domain Project OpenDMARC policy.c improper validation of unsafe equivalence in input",
      "x_generator": [
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    }
  },
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    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-101015",
    "datePublished": "2026-09-28T08:30:08.347Z",
    "dateReserved": "2026-09-27T11:33:01.551Z",
    "dateUpdated": "2026-09-28T08:30:08.347Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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    },
    "nvd": {
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              {
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                  "cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*"
                ],
                "modules": [
                  "Domain Handler"
                ],
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                  },
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                    "version": "1.4.1"
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                  {
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                    "version": "1.4.2"
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        "cveTags": [],
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          }
        ],
        "id": "CVE-2026-101015",
        "lastModified": "2026-09-28T15:15:33.930",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "HIGH",
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          "cvssMetricV40": [
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                "Recovery": "NOT_DEFINED",
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                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
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                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
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      "title": "opendmarc: OpenDMARC: DMARC policy bypass via Unicode dot character equivalence in policy.c Domain Handler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101015.json",
      "version": "3"
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  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.